content/hp5334a.rst

Thu, 10 Nov 2022 16:45:50 +0100

author
David Douard <david.douard@sdf3.org>
date
Thu, 10 Nov 2022 16:45:50 +0100
changeset 141
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Fix a pelican warning on why.rst

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

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