- 
-- 
NOTE 
Do not adjust AIR133 to a level above 
8 
mV  rms.  If the setting is made at 
8 
mV  rrns and the 53348 still counts at 4 mV  rms, a problem exists  in the 
Input Amplifier circuitry. 
5-18. 
MULTIPLE-REGISTER COUNTER (MRC) INPUT ADJUSTMENT, CH 
A 
Reference: 
Figure 
8-20 
Description: 
The Channel 
A 
DC biasing level on the 
MRC 
input signal is optimized at two frequencies on both 
the positive and negative slopes of the signal (interactive adjustment). 
Figrre 
5-8. 
MRC Ir~put AdjusflCl~artnel 
A 
Setup 
f 
HP8656B 
SIGNAL  GENERATOR 
TIMEBASE 
IN 
Equipment: 
Signal Generator 
............................. 
HP 8656B 
HP5334B 
UNIVERSAL  COUNTER 
TIMEBASE  OUT 
Procedure: 
B-1 
O 
" 
~~Io~IR 
- 
1. 
Set the 
Signal 
Generator as follows: 
Frequency 
......................................... 
70 
MHz 
Amplitude 
........................................ 
28.0 
mV 
+- 
0.3 
mV 
A 
mr 
OUTPUT 
\ 
2 
TS22-L2 
HP 5334B 
- 
Scrvicc Manual 
5-13