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| 1 ======================================== | |
| 2 EIP 545B RF Frequency Counter - Part 5 | |
| 3 ======================================== | |
| 4 | |
| 5 :author: David Douard | |
| 6 :Category: Electronics | |
| 7 :Tags: test equipment, RF, EIP, 545, 545A, 545B, 575A, 578A, counter | |
| 8 :series: EIP545B Frequency Counter | |
| 9 :series_index: 5 | |
| 10 | |
| 11 | |
| 12 Thanks to HighPrecision_, I've been able to get a copy of an old version of the | |
| 13 EIP documentation *"Additional Service Information for 5XX CW Counters"*. It's | |
| 14 unfortunately unavailable online, still, it contains a lot of valuable | |
| 15 information. | |
| 16 | |
| 17 .. _HighPrecision: https://www.eevblog.com/forum/profile/?u=116109 | |
| 18 | |
| 19 The part dedicated to verifying the Band 3 Microwave Converter (A203) is as | |
| 20 follows. | |
| 21 | |
| 22 | |
| 23 Functional verification of the microwave converter | |
| 24 ================================================== | |
| 25 | |
| 26 If you are experiencing any problems in band 3 mode of the EIP 53X, 54X or 57X | |
| 27 counters, the following procedure can be used to determine whether the problem | |
| 28 is in the microwave convertor or the basic counter. | |
| 29 | |
| 30 | |
| 31 This note describes the verification of the convertor into functional blocks, | |
| 32 these include: | |
| 33 | |
| 34 A. VCO | |
| 35 | |
| 36 B. YIG filter and video circuit | |
| 37 | |
| 38 C. 15 dB detected RF amplifier | |
| 39 | |
| 40 D. VCO power amplifier | |
| 41 | |
| 42 E. RF leakage | |
| 43 | |
| 44 If any section of the converter does not conforms to the verification | |
| 45 procedure, the convertor assembly is defective and should be returned to the | |
| 46 factory for exchange. If the module performs according to the checkout | |
| 47 procedure, further troubleshooting is required in the basic counter. Please | |
| 48 refer to the manual and to other sections in this binder or consult the factory | |
| 49 for assistance. | |
| 50 | |
| 51 =============== ======== ============================== | |
| 52 Models Affected CCN Applicable Microwave Convertor | |
| 53 =============== ======== ============================== | |
| 54 535 /B all 2010241-01/03/05 | |
| 55 538 /B all 2010241-01/03/05 | |
| 56 545 all 2010137-01 | |
| 57 548 all 2010137-02/03 | |
| 58 545A 2201 2010137-01 | |
| 59 548A 2301 2010137-02/03 | |
| 60 545A /B 2202-... 2010241-01/03/05 | |
| 61 548A /B 2302-... 2010241-02/04/06 | |
| 62 575A all 2010241-01/03/05 | |
| 63 578A all 2010241-02/04/06 | |
| 64 =============== ======== ============================== | |
| 65 | |
| 66 The difference between 2010137 and 2010241 convertors is the VCO board | |
| 67 utilized. The difference makes the converter non-interchangeable. | |
| 68 | |
| 69 The 2010137-03 is the direct replacement of the 2010137-02. | |
| 70 | |
| 71 2010241-: | |
| 72 | |
| 73 :01/02: IF frequency = 125MHz | |
| 74 | |
| 75 :03/04: IF frequency = 127MHz | |
| 76 | |
| 77 :05/06: IF frequency = 127MHz /no check of linearity | |
| 78 linearity corrected by software (test 90) | |
| 79 used in 2 MHz units | |
| 80 | |
| 81 The following tests can be performed to verify the operation of the microwave | |
| 82 convertor. | |
| 83 | |
| 84 | |
| 85 VCO verification | |
| 86 ---------------- | |
| 87 | |
| 88 1. Monitor A108 tp 14 (2020198 or 2020200) with DVM (for 2020138 use tp 4). | |
| 89 | |
| 90 2. Monitor A109J2 with a spectrum analyzer. Set the center frequency to | |
| 91 370MHz. | |
| 92 | |
| 93 3. Program the VCO for 370MHz trough the keyboard:: | |
| 94 | |
| 95 press TEST 1 0 | |
| 96 press 9 8 2 2 1 8 (182218 -- 2 MHz unit) | |
| 97 press 9 8 2 0 5 0 (182050 -- 2 MHz unit) | |
| 98 | |
| 99 *The VCO frequency at A109J2 should be exactly 370 MHz.* Refer to the following | |
| 100 table for the appropriate VCO tuning voltage. | |
| 101 | |
| 102 ======== == ================== | |
| 103 A108 P/N TP VCO tuning voltage | |
| 104 ======== == ================== | |
| 105 2020138 4 > -4.00 VDC | |
| 106 2020198 14 > -4.00 VDC | |
| 107 2020200 14 + 1.5VDC +/- .25 V | |
| 108 ======== == ================== | |
| 109 | |
| 110 4. program the VCO for 500 MHz trough the keyboard:: | |
| 111 | |
| 112 press 9 8 2 2 2 5 (182225 -- 2 MHz unit) | |
| 113 press 9 8 2 0 0 0 (182000 -- 2 MHz unit) | |
| 114 | |
| 115 *The VCO frequency at A109J2 should be exactly 500 MHz.* Refer to the | |
| 116 following table for the appropriate VCO tuning voltage. | |
| 117 | |
| 118 ======== == ================== | |
| 119 A108 P/N TP VCO tuning voltage | |
| 120 ======== == ================== | |
| 121 2020138 4 > +9.5 VDC +/- .5V | |
| 122 2020198 14 > +10 VDC +/- .5V | |
| 123 2020200 14 + 10 VDC +/- .25 V | |
| 124 ======== == ================== | |
| 125 | |
| 126 5. select test 07 from the front panel:: | |
| 127 | |
| 128 press RESET | |
| 129 press TEST 0 7 | |
| 130 | |
| 131 *The VCO should sweep from 370 MHz to 500 MHz in 50 kHz steps with no | |
| 132 break-up. Any spur should be less than 60 dBc.* | |
| 133 | |
| 134 YIG filter and video circuit verification @ 1GHz. | |
| 135 ------------------------------------------------- | |
| 136 | |
| 137 In order for this test to work, the counter must placed in the test 10 mode | |
| 138 and there should not be any signal applied to the Band 3 input prior to | |
| 139 entering test 10. | |
| 140 | |
| 141 1. Monitor terminal E5 of the convertor with the Y channel of an | |
| 142 oscilloscope trough a X1 proble. | |
| 143 | |
| 144 2. Connect the horizontal output of a sweeper to the X input. | |
| 145 | |
| 146 3. No input signal to the counter. | |
| 147 | |
| 148 4. Turn the counter off and back on again. Tune the YIG to 1 GHz trough the | |
| 149 keyboard:: | |
| 150 | |
| 151 press TEST 1 0 | |
| 152 press 9 8 4 2 0 1 (184201 -- 2 MHz unit) | |
| 153 press 9 8 4 0 RESET 4 (1840F4 -- 2 MHz unit) | |
| 154 | |
| 155 Input a -20dBm signal sweeping from 900 MHz to 1.1 GHz into the Band 3 | |
| 156 input. Adjust the offset pot on A108 to center the bandpass of the YIG | |
| 157 filter on the display. Reduce the power to -20dBm. *The detected envelope | |
| 158 of the filter should be a minimum of 4mV in amplitude with a DC offset | |
| 159 less than +/- 50 mV.* | |
| 160 | |
| 161 Offset adjustment reference designators | |
| 162 | |
| 163 =================== =========== | |
| 164 2020138 A108 R14 | |
| 165 2020198 A108 R13 | |
| 166 2020200 A108 R10 | |
| 167 2020200 (2MHz unit) use test 10 | |
| 168 =================== =========== | |
| 169 | |
| 170 2 MHz unit:: | |
| 171 | |
| 172 press TEST 10 | |
| 173 | |
| 174 a. press 1840XX | |
| 175 b. every bit will change the center with 2 MHz | |
| 176 c. goto a. till adj. is done | |
| 177 | |
| 178 :note: data on 1842 most significant ! (value 1 bit = 510 MHz) | |
| 179 data on 1840 least significant ! | |
| 180 | |
| 181 15 dB detected RF amplifier on/off verification. | |
| 182 ------------------------------------------------ | |
| 183 | |
| 184 Change the input to 1 GHz, +5dBm. *The detected RF voltage at E5 should be | |
| 185 greater than +4VDC.* | |
| 186 | |
| 187 Turn the amplifier off from the keyboard:: | |
| 188 | |
| 189 press 9 9 0 1 3 DATA/CLEAR | |
| 190 1 9 0 1 3 DATA/CLEAR (2MHz unit) | |
| 191 | |
| 192 *The voltage at E5 should decrease by a factor of 30.* | |
| 193 | |
| 194 VCO power AMP on/off verification. | |
| 195 ---------------------------------- | |
| 196 | |
| 197 1. remove the input signal to the counter. | |
| 198 | |
| 199 2. Turn the A203 power amp on trough the keyboard:: | |
| 200 | |
| 201 press TEST 1 0 | |
| 202 press 9 8 4 3 3 RESET (1843F -- 2MHz unit) | |
| 203 | |
| 204 *The voltage at E5 should be greater than 10VDC.* | |
| 205 | |
| 206 3. Turn the power amp off trough the keyboard:: | |
| 207 | |
| 208 press 9 8 4 3 3 7 (184337 -- 2MHz unit) | |
| 209 | |
| 210 *The voltage at E5 should be 0 VDC +/- 50mVDC.* | |
| 211 | |
| 212 IF amp and IF treshold verification. | |
| 213 ------------------------------------ | |
| 214 | |
| 215 1. Program the YIG and VCO to count 1 GHz:: | |
| 216 | |
| 217 press 9 8 4 2 0 1 ; YIG at 1 GHz | |
| 218 press 9 8 4 0 RESET 4 ; | |
| 219 press 9 8 4 3 3 RESET ; power amp on | |
| 220 press 9 8 2 2 2 1 ; | |
| 221 press 9 8 2 0 8 7 ; VCO at 437.4 MHz | |
| 222 | |
| 223 Input 1GHz at -28dBm to Band 3 input connector. Connect the spectrum | |
| 224 analyzer to the IF output port (J1) of the covertor. | |
| 225 | |
| 226 *An IF signal should be displayed approximately 30 dB above the noise floor | |
| 227 at apprimately 125 MHz.* Adjust the input signal as necessary to peak this | |
| 228 signal. | |
| 229 | |
| 230 Remove the analyzer and connect a power meter to the IF output port (J1) | |
| 231 of the convertor trough a 10 dB path. Monitor terminal E2 on the | |
| 232 convertor with a scope and *verify the voltage level to be a TTL low*. | |
| 233 Decrease the input power until the level toggles ta TTL high. *The input | |
| 234 power level should be between -28dBm and -40 dBm. The IF power should be | |
| 235 greater than -5 dBm when E2 toggles from TTL low to a TTL high. The IF | |
| 236 power should ne greater then -4 dBm when E2 toggles from a TTL high to a | |
| 237 TTL low as input power is increased.* | |
| 238 | |
| 239 RF leakage test. | |
| 240 ---------------- | |
| 241 | |
| 242 1. Turn the ocunter off and back on again. | |
| 243 | |
| 244 2. Program the YIG to below 500 MHz through the keyboard:: | |
| 245 | |
| 246 press TEST 1 0 | |
| 247 press 9 8 4 2 0 0 (184200 -- 2MHz unit) | |
| 248 press 9 8 4 0 0 0 (184000 -- 2MHz unit) | |
| 249 | |
| 250 Input a +7 dBm signal sweeping from 1 GHz to 18 (26.5) GHz. *The maximum | |
| 251 measured voltage at E5 should be .5 mV above the offset level noted in | |
| 252 paragraph B above from 1 GHz to 10 GHz and 1mV above the offset level | |
| 253 from 10 GHz to 18 (26.5) GHz.* |
