HP 6826A Service Manual

3-12 VOLTAGE CONTROL
3-13 The VOLTAGE control ® controls the output
level (power supply operation) or gain (variable gain ampli¬
fier operation) of the BPS/A. In powensupply operation,
the VOLTAGE control varies the output voltage from a
maximum negative value (full counterclockwise) through
zero (midposition} to a maximum positive value (full clock¬
wise). In variable gain amplifier operation, the gainls vari¬
able from zero to the maximum gain as the VOLTAGE con¬
trol is varied from full counterclockwise to full clockwise.
In fixed gain amplifier operation, the VOLTAGE control
does not control circuit operation.
3-14 CURRENT CONTROL
3-15 The CURRENT control (6) sets the constant
current output of the BPS/A. This control is operable in all
three modes of operation (power supply, variable gain ampli¬
fier, and fixed gain amplifier) and controls the output cur¬
rent from 0 to the maximum rated output (1.0A for the
6826A and 0.5A for the 6827A). When the instrument
switches from constant voltage to constant current operation,
the CURRENT MODE indicator © tights. Selection of
constant voltage or constant current operation is described
in Paragraphs 3-27 and 3-28,
3-16 VOLTAGE METERING
3-17 The VOLTAGE METER switch (8) permits mon¬
itoring the DC or AC output voltage on voltmeter ® .
The shaded area on the voltmeter face indicates the amount
of output voltage that is available in excess of the norma!
rated output. The voltmeter upper scale reads the bipolar
DC voltage from a maximum negative value through OV to
a maximum positive value, DC accuracy is ±3% of full scale.
The lower scale reads the RMS output voltage from 0 to a
maximum level. AC accuracy is ±5% of full scale. The volt¬
meter ranges selected by the VOLTAGE METER switch are
as follows:
MODEL
VOLTMETER RANGES
DC
AC (RMS)
6826A
6827A
0 to ±6V,0 to ±60V
Oto ±12V,0to± 120V
0-4V (uncai), 0-40V
0-8V (uncai), 0-80V
3-18 CURRENT METERING
3-19 The CURRENT METER switch @ permits
monitoring the DC or AC output current on ammeter (H)
The shaded area on the ammeter face indicates the amount
of output current that is available in excess of the normal
rated output. The ammeter upper scale reads the bipolar
DC current from a maximum negative value through OA to
a maximum positive value. DC accuracy is ±3% of full scale.
The lower scale reads the RMS output current from 0 to a
maximum level. AC accuracy is ±5% of full scale. The am¬
meter ranges selected by the CURRENT METER switch
are as follows:
MODEL
AMMETER RANGES
DC
AC (RMS)
6826A
6827A
0 to ±0.12A,0 to ±1.2A
0 to ±Q.06A,0 to ±0.6A
0 to 0.08A,0 to 0.8A
0 to 0.04A,0 to 0.4A
3-20 TURN-ON CHECKOUT PROCEDURES
-CAUTION--—
Rear terminal strip cover must be in place when
Instrument is in use. Also, the Local/Auto switch,
located inside the unit on board A2 (see Figure 3-9),
is in the Local position (toward rear of unit) as
shipped from the factory. The Local positions is
used for normal operations. The Auto position is
used only for auto-series and auto-parallel operations
(see Paragraphs 3-57 through 3-61). If the switch is
placed in the Auto position for normal operations,
the BPS/A output voltage could latch up (maximum
positive or negative output).
3-21 The following turn-on and checkout procedures
are performed utilizing the front panel controls (Figure 3-2)
and the normal rear terminal strapping connections as re¬
ceived from the factory.
POWER SUPPLY CHECKOUT PROCEDURE
a. Set front panel controls as follows:
MODE switch © — POWER SUPPLY
RANGE switch © - XI
VOLTAGE control © -midposition
CURRENT control (6) — full clockwise
VOLTAGE METER switch @ - low range DC
CURRENT METER switch @ -high range DC
b. Set LINE switch © to ON and observe that
LINE ON indicator © lights.
c. Adjust VOLTAGE control © from full counter¬
clockwise {-) to full clockwise (+} range through 0V and
note that maximum output is attained as indicated on meter
® •
d. Set VOLTAGE-METER switch © to high range
DC and RANGE switch @ to X10 position.
e. Adjust VOLTAGE control © clockwise and
counterclockwise through entire bipolar output voltage
3-3

HP 6826A Specifications

General

Brand	HP
Model	6826A
Category	Power Supply
Language	English