Section Iii Operating Instructions; Controls And Indicators - HP 59501A Operating And Service Manual

SECTION III
OPERATING INSTRUCTIONS
3-1 INTRODUCTION
3-2 This section contains operating instructions and
programming information for the 59501A Isolated D/A,
Power Supply programmer. Since the 59501 A can be used
as a power supply programmer or as D/A converter {low
level dc signal source), operating instructions and program¬
ming examples are provided to cover both applications.
Additional information regarding use of the 59501A is
provided in HP-IB/Power Supply Application Guide, HP
Part No. 5952-3990.
3-3 PRE-OPERATiONAL CONSIDERATIONS
3-4 Before connecting the 59501 A to an ac power
source, ensure that the proper operating voltage (100, 120,
220, or 240Vac) has been selected and the proper fuse is
installed (see paragraph 2-27). Also, check that the address
switches are set correctly, the UNIPOLAR/BIPOLAR mode
switch is set to the desired position, and at! HP-IB system
cabling is installed (see paragraphs 2-20 through 2-26).
Connections between the 59501A and the user's device
(e. g. HP Power Supply) are described in subsequent para¬
graphs.
3-5 CONTROLS AND INDICATORS
3-6 Front Panel
3-7 The 59501A front panel contains a power on indi¬
cator, a status indicator and four controls (screwdriver ad¬
justments) as shown in Figure 3-1.
3-8 The power on (ON) indicator (?) (Figure 3-1)
lights and the 59501 A's internal supply'voltages (+15V,
±15V, V^jj) are present when the line cord is piugged-in.
3-9 The LISTENING indicator
(
5
)
lights when the
59501A is addressed to "listen" and remains lighted until
an "unlisten" command or the interface clear signal is
received from the controller. When lighted, it indicates that
the 59501A is enabled to process data words received on
the HP-IB. When it is not lighted, it indicates that the
59501 A is inhibited from processing data words.
3-10 The front panel screwdriver adjustments allow fast
and easy calibration of D/A and power supply outputs.
Each adjustment is described below.
3-11 The ZERO ADJUST
(5) allows
the 59501A
out^
put to be adjusted to OV ± 250 millivolts when it is program¬
med to zero output. It can also be used to correct for smalt
offsets in power supply response to programmed inputs when
the 59501A is used as a power supply programmer.
3-12 The D/A FULL SCALE ADJUST @ atlbws the
59501A output to be adjusted to maximum (±5%) when it
is programmed to maximum. For example, if the 59501A
is programmed to its maximum unipolar output in the high
range, the D/A FULL SCALE ADJUST is normally used to
set the output to 9.99V. However, it can also be used to
set the output between 9.49V and 10.49V (i. e. 9.99V ±5%).
The D/A FULL SCALE ADJUST is used when the 59501A
is employed as a D/A (see paragraphs 3-75 through 3-82).
When the 59501A is used as a power supply programmer,
the POWER SUPPLY FULL SCALE ADJUST controls are
utilized to set the power supply's output.
3-13 The POWER SUPPLY FULL SCALE ADJUST
controls (COARSE and FINE) (s) enable the user to
set the maximum output desired from the power supply
when the 59501A is programmed to its maximum value.
These adjustments can be used to calibrate the output of a
power supply to its maximum rated output or to any lower
value. For example, a 40Vdc power supply's output could
be set to 20V when the 59501A is programmed to its maxi¬
mum vaiue. In this case, ali 999 programming steps are
utilized in programming the supply from 0 to 20V with a
resolution of 20mV (approx.). Calibration of power supply
outputs is described in paragraph 3-53 through 3-59.
Figure 3-1. 59501A Front Panel
3-1