Rear Panel - HP 59501A Operating And Service Manual

3-14 Rear Panel
3-15 The 59501A rear panel contains the HP-IB connec¬
tor, the ADDRESS switches, the UNIPOLAR/BIPOLAR
mode switch, the ac power module, and the output term¬
inal strip as shown in Figure 3-2.
a. HP-IB connector — Interfaces directly to HP-IB
(paragraph 2-17).
b. ADDRESS switches -• Select "listen" address of
59501A (paragraph 2-22).
c. UNIPOLAR/BIPOLAR switch — Selects either
the unipolar of bipolar output mode (para¬
graph 2-25).
d. Ac Power Module — Contains fuse and ac input
voltage select PC board (paragraph 2-27).
3-16 The 59501A is interfaced with the user's device
via the output terminal strip. Output terminals A1 and A2
allow access to the 59501 A's D/A output while terminals
A3 through A5 allow access to the power supply program¬
ming network. Figure 3-3 illustrates the connections re¬
quired to program the output voltage of a typical HP power
supply. In this case, a jumper is connected between termin¬
als A2 and A3, and terminals A1, A4, and A5 are connected
to the voltage programming terminals of the power supply.
TTie method of programming and the connections required
to program the output voltage or current of various HP
supplies are described in paragraphs 3-37 through 3-74.
When the 59501A is used as a low level dc signal source,
only terminals A1 and A2 are connected to the user's device.
Programming instructions for this application are given in
paragraphs 3-75 through 3-82.
3-17 PROGRAMiVIIMG FUNDAMENTALS
3-1 8 The unipolar or bipolar output of the 59501A is
programmed by a data word comprised of four ASCII
characters (digits) received in the order shown below. The
first digit specifies range and the next three digits specify the
desired output within the selected range. The range digit
must be the number 1 to specify low range or the number 2
to specify high range. The magnitude digits can be any
number from 000 to 999.
D1
D2 D3 D4
/
Range Magnitude
1 or 2 000-999
3-19 The 59501A automatically provides an output
voltage as soon as the four digits are received. This output
is retained until the next four digits are received. The
59501 A is programmed by the magnitude digits in BCD to
produce the desired output voltage. In the unipolar mode,
000 equals 00.0% of full range, 500 equals 50.0% of full
Figure 3-2. 59501A Rear Panel
Figure 3-3. Rear Terminal Strip, Typical Connections
range, and 999 equals 99.9% of full range. In the bipolar
mode, 000 equals the maximum negative voltage output,
500 equals OV output, and 999 equals the maximum positive
voltage output.
3-20 Calculating Data Word Values
3-21 The following paragraphs describe the data word
value calculations required to program the output of the
59501A. Similar calculations are required when program¬
ming power supply outputs using the 59501 A. The pro¬
grammable output range depends, of course, upon the power
supply model being programmed. The desired output range
of the particular power supply must be calibrated for pro¬
gramming with the 59501 A. Power supply calibration pro¬
cedures and sample programs are described in paragraphs
3-53 through 3-74.
3-22 Data word value calculations for the high (lOV)
and low (IV) 59501A output ranges are described below.
Calculations are provided for both the unipolar and bipolar
output modes. Each data word must be exactly four digits
3-2