HP 6826A Service Manual

range through 0 and note that maximum output is attained
as indicated on meter © Adjust output voltage to
+50V.
f. To checkout the constant current circuit, first turn
off BPS/A. Short circuit the front panel terminals {HI OUT
to LO OUT).
g. Turn on supply and observe that CURRENT MODE
indicator © lights and meter (9) indicates 0 volts.
h. Adjust CUR RENT control © from full cw to
full ccw and note that minimum current is attained as indi¬
cated on meter (fl)
i. Turn off supply and remove short from output term¬
inals.
j. Turn on supply and adjust VOLTAGE CONTROL
(§) for an output of —50V.
k. Turn off supply and reconnect short across the HI
and LO OUT terminals.
l. Turn on supply and note that CURRENT MODE in¬
dicator (?) lights and meter © indicates 0 volts.
m. Adjust CURRENT control (6) from full cw to
full ccw and note that minimum current is attained as indi¬
cated on meter (Pi)
n. Turn off BPS/A and remove short from output term¬
inals.
VARIABLE GAIN AMPLIFIER CHECKOUT PROCEDURE
o. Set front panel controls as follows:
MODE switch© -VAR GAIN AMP
RANGE switch @ -XI
VOLTAGE control © — midposition
CURRENT control © — full clockwise
VOLTAGE METER switch © - low range AC
CURRENT METER switch © - high range AC
p. Connect a 1.75V rms, 100Hz input signal to the
front panel input terminals (HI and LO IN).
q. Turn on supply and adjust VOLTAGE control ©
through entire RMS range and note that maximum voltage
is attained as indicated on meter ©) .
r. Set VOLTAGE METER switch © to high range
AC, RANGE switch © to X10, and adjust VOLTAGE
control © through entire RMS range and note that max¬
imum voltage is attained as indicated on meter ©
FIXED GAIN AMPLIFIER CHECKOUT PROCEDURES
s. Set MODE switch ©) to FXD GAIN AMP posi¬
tion and increase input signal to 3.5V rms.
t. Adjust VOLTAGE control ©) through entire
RMS range and note that maximum voltage is attained as
indicated on meter ©)
3-22 OPERATING MODES
—-CAUTION--——
3-23 The position of the front panel MODE switch de¬
termines whether the instrument will be used as a power
supply or an amplifier. In addition, the instrument may be
controlled locally using the front panel VOLTAGE and
CURRENT controls or remotely via terminals on the rear
of the unit. The front panel output terminals (HI and LO
OUT) and input terminals (HI and LO IN) are repeated as
{+ and —) and (A1 and A2) respectively on the rear termin¬
al strip. The rear terminal strip includes sensing (+S and —S)
terminals and other terminals for remote control of the
BPS/A as shown in Figure 3-3. These terminals connect to
various control points within the instrument and allow
strapping connections to be made which enable the power
supply or amplifier to be utilized in many applications. The
following paragraphs describe the procedures for utilizing
the various operational capabilities of the power supply. A
more theoretical description concerning the operational
features of this supply is contained in Application Note 90
and in various Tech. Letters. Copies of these can be obtained
from your local Hewlett-Packard field office.
SIGNAL INPUT
TERMINALS
hfT'T
(LO) i (HI)
OUTPUT
— TERMINALS
REMOTE RANGE
CONTROI
CONSTANT
VOLTAGE
PROGRAMMING
( + ) CONSTANT
CURRENT
PROGRAMMING
r . 1 . —\
AS AS AIO All .412 AI3 A14
0|0]0j0
CONSTANT CURRENT
FLAG OUTPUT
PROGRAM INTERRUPT (-) CONSTANT
RELAY CONTROL I CURRENT PROGRAMMING
,. J . ' r .- - - A
' AI5 AI6'AI7'Al8 AI9 420 A2I
0 0| 0j0j C") /> 0
Figure 3-3. Rear Terminal Strip
3-24 LOCAL PROGRAMMING
3-25 The BPS/A is shipped with its rear terminal strap¬
ping connections arranged for constant voltage/constant
current, local programming, local sensing, single unit mode
of operation. This strapping pattern is illustrated in Figure
3-4. Also, the Local/Auto switch on board A2 (see Para¬
graph 3-54) is in the Local position when the instrument is
shipped from the factory. This switch mu s t be in the Local
position for single unit mode of operation.
Rear terminal strip cover must be in place when
instrument is in use.
3-26 The operator selects either power supply, variable
gain amplifier, or fixed gain amplifier operation (MODE
3-4

HP 6826A Specifications

General

Brand	HP
Model	6826A
Category	Power Supply
Language	English