Fluke PM6690, Service Manual, Page: 12 / 200

General Information
WARNING: Before turning on the instru-
ment, ensure that it has been installed in
accordance with the Installation Instruc-
tions
outlined in Chapter 1 of the
Operators Manual.
This performance procedure is intended for:
– checking the instrument’s specification.
– incoming inspection to determine the acceptability of
newly purchased instruments and recently recalibrated
instruments.
– checking the necessity of recalibration after the specified
recalibration intervals.
NOTE: The procedure does not check every facet of the in-
strument’s calibration; rather, it is concerned primarily
with those parts of the instrument which are essential
for determining the function of the instrument.
It is not necessary to remove the instrument cover to perform
this procedure.
Test Equipment
Preparations
Power up your instrument at least 30 minutes
before checking to let it reach normal operating
temperature. Failure to do so may result in cer-
tain test steps not meeting equipment specifications.
Front Panel Controls
Internal Self-Tests
The test programs forming the self-diagnosis can be activated
from the front panel as follows:
– Press
USER OPT
– Press
Test
.
– Press
Test Mode
.
– Select one of the six tests available by pressing the
softkey below the label with the name of the test func-
tion. Five of the tests (RAM, ROM, Logic, Display, and
Interface) are individual. They are briefly described be-
low. The sixth, named
All , performs all five individual
tests in sequence.
•
All - all tests performed in sequence
•
RAM - test of RAM memory
•
ROM - test of ROM memory
•
Logic - test of counter ASIC and other logic circuits.
•
Display - test of graphic display
module
•
Interface - test of GPIB and USB
– Press Start Test .
– If a fault is detected, an error message appears on the
display and the program halts. Note any error messages.
– If no faults are detected, the instrument returns to the
normal measurement mode.
Keyboard Test
See Table 2-3. This test verifies that the timer/counter re-
sponds when you press any key. It is not a functional test.
Such tests are performed later in this chapter. The important
thing here is that something changes on the display when you
press a key. Consequently you can press the keys in almost
any order without paying attention to the exact response, but
for those who want to be more systematic there is a table over-
leaf, where all keys are exercised at least once.
Press the keys as described in the first column and look at the
display for the text in the second column. Some keys change
more text on the display than described here. The display text
mentioned here is the one mostly associated with the selected
key.
NOTE: For the instrument to respond correctly, this test
must be carried out in sequence and you must start
with the DEFAULT setting. Do as follows:
– Press
USER OPT
.
– Press
Save/Recall
.
– Press
Recall Setup
.
– Press
Default
.
See Table 2-2 for the complete list of default settings.
2-2 Performance Check, General Information
Type of Equipment Required Specifications
Reference Oscillator
10 MHz, 1*10
–8
(e.g. 908) for calibrat-
ing PM6690/_1_
10 MHz, 1*10
–9
(e.g. 909) for calibrat-
ing PM6690/_5_ & PM6690/_6_
Voltage Calibrator
DC -50 V to +50 V (e.g. 5500A) for
calibrating the built-in voltage refer-
ence, alternatively corresponding DC
power DVM with uncertainty
<0.1 %
LF Synthesizer Square/ Sine up to 10 MHz, 10 V
RMS
Pulse Generator
2 ns rise time, 5 V peak, >10 MHz,
continuous & one-shot trigger
Oscilloscope 350 MHz, <3% voltage uncertainty
RF Signal Generator
10 MHz to 3 or 8 GHz dep. on
prescaler option, 10 MHz ext.ref.
Power Splitter 50
W
6 dB BNC
T Adapter (F-M-F) BNC
Termination 50
W
feedthrough BNC
Lowpass Filter 50 kHz (for 1 M
W
load)
BNC Cables 5 to 7 pcs of suitable lengths
Table 2-1
Recommended equipment for calibration and per-
formance check.