HP 8082A Operating And Service Manual page 55
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ADJUSTMENTS
Risetirne, Overshoot (1 n-5n Transition Time)
Amplitude,
1
8082A settings:
1
REPETITION
RATE
3
DOUBLE/NORM
7 MODE SWITCH
8 WIDTH
10
TRANSITION
TIME
AMPLITUDE
14
AMPLITUDE
15 AMP VERNIER
47 OFFSET SWITCH
19 NORM/COMPL
2
Verify tests 8, 10 in Table 5-16.
3
Adjust A4 R214, R232 for max output voltages > 515V
then optimize settings for acceptable pulse shape.
NOTE: A5 R210 may be readjusted if difficulty is experienced
in reaching the maximum amplitude with the A4 R214/232
adjustment (-6.96V to -6.77V is permissible; 1OOmV variation
means about 6OmV output amplitude variation).
See Table 5-16 test 10.
4
Readjust A4 R214 for a baseline shift <7OmV (worst
case: both channels, norm and complj.
5
Set amplitude vernier CCW (i.e. 2V output). If a hook is
apparent on leading edge, adjust A4 R214. then A4 R232, for an
acceptable pulse shape. Repeat steps 3 and 4 adjust for best
compromise
6
Turn amplitude vernier CW and transition time verniers
CCW. Adjust A4 R253 for -6.3 2 0.1 V at R253 wiper (TP 16).
7
Set 8082A transition time to ln-5ns LE-vernier CW.
Select A6 R 142 for a transition time '>6.5ns and <7.5ns in the
worst case of both edges.
NOTE: A5 R142 has possible values 1.87 K . . . 3.01 K.
8
Verify tests 4, 8, 10 in Table 5-16
Measure transition times, overshoot and ringing.
N O T E :
1. fast edges ha-de
greater overshoot and ringing than
slower ones.
2 . positive output pulses will be slightly faster than
negative ones.
3 . A4 R214, R232 also affect transition times (but see
steps 3. 4, 5 above).
4 . Transition times and overshoot are affected by the
inductors (wires) parallel to A4 CR32, CR33. A l-cm
variation of wire length is allowed. corresponding to
It is permissible to adjust UCfH (Table 5-16 Tast 81
in the ranga -14&V to -14.51 V f 5mV. and UCfH
in the range -14.78V to -1484V * 5mV. without
readjusting UC8H and UCBL.
This decreases the transition times by about 4Ops and
increases overshoot by about 1% absolute compared
with the values given in Table 5-16 Test 8. If these
adjustments are mada. repeat steps 3 to 5.
NORM
EXT WIDTH
SQUARE
WAVE
2 0 - 5 . 0
c w
O FF
NORM
M E G
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