HP 6296A - Page 36

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i. Reading on differential voltmeter should
not vary from reading recorded in step g by more
than the following (variations expressed in mVdc):
Model 6282A 628SA 6286A 6290A 6291A 6296.A
Variation :2 :±3 :1:3 :5 ±5 :7
5-18 Ripple and Noise. To check the ripple and
noise, proceed as follows:
a. Retain test setup used for previous line
regulation test except connect AC voltmeter across
output terminals as shown in Figure 5-6.
b. Adjust variable auto transformer for 125
VAC input.
c. Set METER switch to highest current range.
d. Turn CURRENT controls fully clockwise
and adjust VOLTAGE controls until front panel meter
indicates exactly the maximum rated output voltage.
e. AC voltmeter should read less than
O. 50mVrms.
POWER SUPPLY
UNDER 'ltST
LOAO RtSISTORS
AC VOLTMma
,, 403 •
Figure S-6. Ripple and Noise. Constant Voltage
5-19 Transient Recovery Time. To check the
transient recovery time proceed as follows:
a. Connect test setup shown in Figure 5-7.
b. Turn CURRENT controls fully clockwise.
c. Set METER switch to highest current
range and turn on supply •
. d. Adjust VOLTAGE ~ontrols until front panel
meter indicates exactly the maximum rated output
current or S amperes, whichever is smaller.
e. Close line switch on repetitive load
switch setup.
5-5
POWtR SUPPLY
UNDER TEST
+
OSCILLOSCOPE
,, 140A
0 0-+--------------------1-.0
G
0
CONTACT PROTECTION
Ntl'WORIC
Ry
l..ld I" SW
200V (NOTE 31 Rx
f----·Vlll.--..l\/V\.--1
~ODEL NO.
RESIS A~·
•~u~••
Rx
a.,
6282A 0.10
0.90
628SA 0.20
3. 80
6286A 0.10
1.90
6290A
0.
33
13. 0
6291A
0.20
7. 80
6296" 0. 33 I
1'. 66
.,
I
NOTES:
I. THIS DRAWING SHOWS
A SVCGESTED METHOD
or BUILDING A L~D
SWITCH. HOWMR.
OTHER METHODS COULD
IE USED: SUCH AS A
TRANSISTOR SWITCHING
NETWORK. MAXIMUM
LOAD RAnNGS or LOAD
SWITCH ARE; S AMPS.
SOOV. ZSOW INOT 2S0'1Wl
2. USE MERCURY REIAY:
CURE TYPE HGP I 002 OR
W. E. TYPE 2768.
l. USE Wtat WOUND RC.~ISTOR.
Figure S-7. Transient Response, Test Setup
f. Adjust 2SK potentiometer until a stable
dis play is Qbtained on oscilloscope. Waveform
should be within the tolerances shown in Figure S-8
(output should return to within 15 mV of original
value in less than 50 microseconds).
I
1-so..stc-t
UNLOADING TRANSIENT
f---so .... ~ J __
I I ISMV
ov-r-----__,,,c.... ____ ,i;;:::;::;._-r--
~DING TRANSIENT
Figure 5-8. Transient Response Waveforms
_:s-20 Output Impedance. To check the output im-
pedance, proceed as follows:
a. Connect test setup shown in Figure S-9 •