content/hp5334a.rst

Sat, 19 Mar 2016 00:53:20 +0100

author
David Douard <david.douard@logilab.fr>
date
Sat, 19 Mar 2016 00:53:20 +0100
changeset 43
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parent 32
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[10MHz] new small follow-up for the 10MHz freq reference series

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1 =================================================
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2 Quick overview of the HP5334A Universal Counter
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3 =================================================
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4
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5 :author: David Douard
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6 :date: 2016-03-12
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7 :Category: Electronics
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8 :Tags: test equipment, 10MHz, Rubidium, hp5334a, counter
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10
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11 The HP5334A is a decent universal counter. It has a two 100MHz
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12 channels. Some models come with an optional third channel (1.3GHz), an
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13 optinal DVM, and an optional oven controlled
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14 oscillator. Unfortunately, my meter has no option at all.
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16 .. image:: {filename}images/hp5334a/front.jpg
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17 :alt: My HP5334A Universal Counter
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19 There is a nice quick instruction set printed on the top cover:
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20
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21 .. image:: {filename}images/hp5334a/top.jpg
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22 :alt: HP5334A Quick Instruction Set
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23
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24
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25 On the rear panel are 2 BNC (ref in/out and gate), the power socket
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26 and the GPIB connector. One thing is a bit annoying on this device,
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27 it's the fact that there is only one BNC for both the external 10MHz
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28 reference input and the internal 10MHz reference output, with a small
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29 Ext/Int switch to select the mode. So I have to reach the rear of the
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30 device to switch this later when I want to use my `Efratom 10MHz
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31 reference standard`_ (since I don't intent to keep it running every
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32 time I want to user the 5334).
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33
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34 When removing the covers, one can see:
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35
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36 .. image:: {filename}/images/hp5334a/pcb.jpg
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37 :alt: The top view of the PCB.
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38
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39 with a very nice star-shaped ground lattice. Among other interesting
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40 things are these funny little variable caps:
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41
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42 .. image:: {filename}/images/hp5334a/c89.jpg
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43 :alt: C89, a nice little variable cap.
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44
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45 And as one may expect in such a device, no fan.
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46
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47 The bottom side of the PCB looks like:
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49 .. image:: {filename}/images/hp5334a/pcb_bottom.jpg
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50 :alt: The bottom view of the PCB.
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51
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52 Adjustment
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53 ==========
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54
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55 My 5334 does not have the high stability timebase option (Option 010),
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56 so my counter's stability specs are:
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57
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58 - aging rate < 0.3 ppm per month
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59 - tempco < 5 ppm (0°c to 50°C)
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60 - line voltage < 0.1 ppm for 10% change
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61
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62 And it was not so out of specs:
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63
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64 .. image:: {filename}/images/hp5334a/uncal.jpg
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65 :alt: Measuring a 1kHz reference
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66
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67 In this picture, the signal is a 1kHz sine wave generated by a
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68 HP8904A_ using my `Efratom 10MHz reference standard`_ as 10MHz
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69 reference, so it should be pretty close to a solid 1.000000kHz. The
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70 gate time delay is the default 0.3s.
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71
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72 On this device, the crital oscillator adjustement variable capacitor
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73 is accessible directly from the rear panel. I guess that without the
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74 high stability option, the 10MHz time base was not part of the
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75 calibration process and had to be adjusted quite often.
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76
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77 So I've used the rubidium reference standard to adjust the internal
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78 10MHz oscillator and I have, for now, a mush better 10MHz internal
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79 clock (here we measure directly the 10MHz signal, and the gate time
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80 delay has been set to 1s, as described in the service manual when
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81 adjusting the oscillator):
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82
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83 .. image:: {filename}/images/hp5334a/cal.jpg
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84 :alt: After adjustement against the rubidium reference standard.
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85
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86 The adjustment capacitor is not fine enough to reach a spot 10MHz
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87 value, the best I could achieve is a 0.2Hz away from the expected
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88 value, which is quite excellent, actually.
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89
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90 But let's see within the next few days if it drifts a lot or not (as I
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91 am writing this, it has moved a tiny bit to 10.0000005 MHz... 0.5Hz
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92 off, something like 0.05 ppm).
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93
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94
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95 .. _`Efratom 10MHz reference standard`: {filename}/10MHz_ref.rst
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96 .. _HP8904A: {filename}/hp8904a.rst

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