Channel B Sensitivity Offset Adjustment - HP 5334B Service Manual

Conlinue to repeat steps 5 and 6 until no further adjustment can be made because the signal level drops
below the Counter's sensitivity limit (indicated by the GATE LED staying on continuously and no display up.
date or an inaccurate reading).
7. Set the function generator amplitude to 6.5 mV rms.
8. Adjust AIR132 to the point at which the 5334B stops counting and then carefully adjust AIR132 so the
5334B just starts counting and accurately displays 1.000 000 00 MHz
k
0.06 Hz.
9. Set the function generator amplitude to 4 mV rms.
10. Verify that the 5334B does not count the 1 MHz signal.
If the 5334B is able to count at 4 mV rms, set the function generator amplitude to 7 mV rms and rcpcat
steps 8,9, and 10. If necessary, step 8 can be performed at 7.5 or 8.0 mV rms so that there is no count at
4 mV rms.
NOTE
Do not adjust AIR132 to a level above
8
mV rms. If the setting is made at
8
mV rms and the
53348
still counts at 4 mV rms, a problem exists in the
Input Amplifier circuitry.
5-17. CHANNEL B SENSITIVITY OFFSET ADJUSTMENT
Reference: Figure 8-20 and 8-21
Description:
The sensitivity of the Channel B Input is adjusted using
a 1
MHz input signal (interactive adjust-
ment).
r
3
H P 3 3 2 5 A
SYNTHESIZER/
FUNCTION
GENERATOR
TIMEBASE IN
H P 5 3 3 4 B
UNIVERSAL COUNTER
TIMEBASE OUT
...
..
ooooo
00
o o o o o
B-
\
J
TSZl-L2
*
Figure 5-7. Clturtrlel B Sertsitir~ify Afljlrst Selq?
H P 5334B
-
Scrvicc Manual
5-1
1