changeset
[eip545b] part 5
Tue, 27 Feb 2018 23:38:50 +0100
- author
- David Douard <david.douard@logilab.fr>
- date
- Tue, 27 Feb 2018 23:38:50 +0100
- changeset 84
- c838d0a9f9a9
- parent 83
- 8f5d4051eed6
- child 85
- fc017978203c
[eip545b] part 5
| content/eip545b_5.rst | file | annotate | diff | comparison | revisions |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/content/eip545b_5.rst Tue Feb 27 23:38:50 2018 +0100 @@ -0,0 +1,253 @@ +======================================== + EIP 545B RF Frequency Counter - Part 5 +======================================== + +:author: David Douard +:Category: Electronics +:Tags: test equipment, RF, EIP, 545, 545A, 545B, 575A, 578A, counter +:series: EIP545B Frequency Counter +:series_index: 5 + + +Thanks to HighPrecision_, I've been able to get a copy of an old version of the +EIP documentation *"Additional Service Information for 5XX CW Counters"*. It's +unfortunately unavailable online, still, it contains a lot of valuable +information. + +.. _HighPrecision: https://www.eevblog.com/forum/profile/?u=116109 + +The part dedicated to verifying the Band 3 Microwave Converter (A203) is as +follows. + + +Functional verification of the microwave converter +================================================== + +If you are experiencing any problems in band 3 mode of the EIP 53X, 54X or 57X +counters, the following procedure can be used to determine whether the problem +is in the microwave convertor or the basic counter. + + +This note describes the verification of the convertor into functional blocks, +these include: + +A. VCO + +B. YIG filter and video circuit + +C. 15 dB detected RF amplifier + +D. VCO power amplifier + +E. RF leakage + +If any section of the converter does not conforms to the verification +procedure, the convertor assembly is defective and should be returned to the +factory for exchange. If the module performs according to the checkout +procedure, further troubleshooting is required in the basic counter. Please +refer to the manual and to other sections in this binder or consult the factory +for assistance. + +=============== ======== ============================== +Models Affected CCN Applicable Microwave Convertor +=============== ======== ============================== +535 /B all 2010241-01/03/05 +538 /B all 2010241-01/03/05 +545 all 2010137-01 +548 all 2010137-02/03 +545A 2201 2010137-01 +548A 2301 2010137-02/03 +545A /B 2202-... 2010241-01/03/05 +548A /B 2302-... 2010241-02/04/06 +575A all 2010241-01/03/05 +578A all 2010241-02/04/06 +=============== ======== ============================== + +The difference between 2010137 and 2010241 convertors is the VCO board +utilized. The difference makes the converter non-interchangeable. + +The 2010137-03 is the direct replacement of the 2010137-02. + +2010241-: + + :01/02: IF frequency = 125MHz + + :03/04: IF frequency = 127MHz + + :05/06: IF frequency = 127MHz /no check of linearity + linearity corrected by software (test 90) + used in 2 MHz units + +The following tests can be performed to verify the operation of the microwave +convertor. + + +VCO verification +---------------- + +1. Monitor A108 tp 14 (2020198 or 2020200) with DVM (for 2020138 use tp 4). + +2. Monitor A109J2 with a spectrum analyzer. Set the center frequency to + 370MHz. + +3. Program the VCO for 370MHz trough the keyboard:: + + press TEST 1 0 + press 9 8 2 2 1 8 (182218 -- 2 MHz unit) + press 9 8 2 0 5 0 (182050 -- 2 MHz unit) + + *The VCO frequency at A109J2 should be exactly 370 MHz.* Refer to the following + table for the appropriate VCO tuning voltage. + + ======== == ================== + A108 P/N TP VCO tuning voltage + ======== == ================== + 2020138 4 > -4.00 VDC + 2020198 14 > -4.00 VDC + 2020200 14 + 1.5VDC +/- .25 V + ======== == ================== + +4. program the VCO for 500 MHz trough the keyboard:: + + press 9 8 2 2 2 5 (182225 -- 2 MHz unit) + press 9 8 2 0 0 0 (182000 -- 2 MHz unit) + + *The VCO frequency at A109J2 should be exactly 500 MHz.* Refer to the + following table for the appropriate VCO tuning voltage. + + ======== == ================== + A108 P/N TP VCO tuning voltage + ======== == ================== + 2020138 4 > +9.5 VDC +/- .5V + 2020198 14 > +10 VDC +/- .5V + 2020200 14 + 10 VDC +/- .25 V + ======== == ================== + +5. select test 07 from the front panel:: + + press RESET + press TEST 0 7 + + *The VCO should sweep from 370 MHz to 500 MHz in 50 kHz steps with no + break-up. Any spur should be less than 60 dBc.* + +YIG filter and video circuit verification @ 1GHz. +------------------------------------------------- + +In order for this test to work, the counter must placed in the test 10 mode +and there should not be any signal applied to the Band 3 input prior to +entering test 10. + +1. Monitor terminal E5 of the convertor with the Y channel of an + oscilloscope trough a X1 proble. + +2. Connect the horizontal output of a sweeper to the X input. + +3. No input signal to the counter. + +4. Turn the counter off and back on again. Tune the YIG to 1 GHz trough the + keyboard:: + + press TEST 1 0 + press 9 8 4 2 0 1 (184201 -- 2 MHz unit) + press 9 8 4 0 RESET 4 (1840F4 -- 2 MHz unit) + + Input a -20dBm signal sweeping from 900 MHz to 1.1 GHz into the Band 3 + input. Adjust the offset pot on A108 to center the bandpass of the YIG + filter on the display. Reduce the power to -20dBm. *The detected envelope + of the filter should be a minimum of 4mV in amplitude with a DC offset + less than +/- 50 mV.* + + Offset adjustment reference designators + + =================== =========== + 2020138 A108 R14 + 2020198 A108 R13 + 2020200 A108 R10 + 2020200 (2MHz unit) use test 10 + =================== =========== + + 2 MHz unit:: + + press TEST 10 + + a. press 1840XX + b. every bit will change the center with 2 MHz + c. goto a. till adj. is done + + :note: data on 1842 most significant ! (value 1 bit = 510 MHz) + data on 1840 least significant ! + +15 dB detected RF amplifier on/off verification. +------------------------------------------------ + +Change the input to 1 GHz, +5dBm. *The detected RF voltage at E5 should be +greater than +4VDC.* + +Turn the amplifier off from the keyboard:: + + press 9 9 0 1 3 DATA/CLEAR + 1 9 0 1 3 DATA/CLEAR (2MHz unit) + +*The voltage at E5 should decrease by a factor of 30.* + +VCO power AMP on/off verification. +---------------------------------- + +1. remove the input signal to the counter. + +2. Turn the A203 power amp on trough the keyboard:: + + press TEST 1 0 + press 9 8 4 3 3 RESET (1843F -- 2MHz unit) + + *The voltage at E5 should be greater than 10VDC.* + +3. Turn the power amp off trough the keyboard:: + + press 9 8 4 3 3 7 (184337 -- 2MHz unit) + + *The voltage at E5 should be 0 VDC +/- 50mVDC.* + +IF amp and IF treshold verification. +------------------------------------ + +1. Program the YIG and VCO to count 1 GHz:: + + press 9 8 4 2 0 1 ; YIG at 1 GHz + press 9 8 4 0 RESET 4 ; + press 9 8 4 3 3 RESET ; power amp on + press 9 8 2 2 2 1 ; + press 9 8 2 0 8 7 ; VCO at 437.4 MHz + + Input 1GHz at -28dBm to Band 3 input connector. Connect the spectrum + analyzer to the IF output port (J1) of the covertor. + + *An IF signal should be displayed approximately 30 dB above the noise floor + at apprimately 125 MHz.* Adjust the input signal as necessary to peak this + signal. + + Remove the analyzer and connect a power meter to the IF output port (J1) + of the convertor trough a 10 dB path. Monitor terminal E2 on the + convertor with a scope and *verify the voltage level to be a TTL low*. + Decrease the input power until the level toggles ta TTL high. *The input + power level should be between -28dBm and -40 dBm. The IF power should be + greater than -5 dBm when E2 toggles from TTL low to a TTL high. The IF + power should ne greater then -4 dBm when E2 toggles from a TTL high to a + TTL low as input power is increased.* + +RF leakage test. +---------------- + +1. Turn the ocunter off and back on again. + +2. Program the YIG to below 500 MHz through the keyboard:: + + press TEST 1 0 + press 9 8 4 2 0 0 (184200 -- 2MHz unit) + press 9 8 4 0 0 0 (184000 -- 2MHz unit) + + Input a +7 dBm signal sweeping from 1 GHz to 18 (26.5) GHz. *The maximum + measured voltage at E5 should be .5 mV above the offset level noted in + paragraph B above from 1 GHz to 10 GHz and 1mV above the offset level + from 10 GHz to 18 (26.5) GHz.*
