HP 59501A Operating Manual page 13

The 59501A is an HP-IB instrument capable of perfor¬
ming a LISTEN function on the interface bus. It is pro¬
grammed by a data word comprised of four digits. The
first digit selects the range and the following three digits
specify the desired output within the range, in terms of
percentage of full scale. The 59501A output is either
unipolar or bipolar, depending on the position of the
mode switch on the back panel. Table 2 shows a few
examples of programmed data words.
D1 D2 D3 D4
Range Magnitude
1 - Low Range 000-999
2- High Range
% of Power
Supply Rill
Scale Output
SSSOtA
Output
Programmed
Data Word
UNEPOiAR
99.3% 9.39 V 2999
m%
5.00 V
2m
3.39% 0.9^ V
1999
5.03%
0.500 V
laifl
ov
1000, 2000
BEPOLAR
Positive Qu^t
99.8% 9.98 V 2999
50.0% 5.1BV 2750
9.98% 0.998 V
19^
0%
ov 2ai0, 1M0
Negative Output
100%
-10 V 2Klfl
10% -1 V 1000
__ .
NOTE:
1. The programmed data word is converted into an in¬
teger. Decimal points are not allowed.
2. 0.5 is added to the word before the integer conver¬
sion, so the value will be rounded up if the first
decimal place is 0.5 or greater.
NOTE:
1. The programmed data word is converted into an
integer. Decimal points are not allowed.
2, 0.5 is added to the word before the integer con¬
version, so the value will be rounded up if the first
decimal place is 0.5 or greater.
Figure 40.
Range Decoding Flowchart.
Note:
The 59501A-power supply combination must
be calibrated before programming to avoid possi¬
ble damage to the power supply.
CV Power Supply Programming:
To set the output voltage of a 60 V supply to 30 V.
1. Compute 30/60 = 50%.
2. Program
Before choosing the three magnitude digits, the
range digit must be selected,
The low range covers 0-9.99% {0-0.999 volts), and
the high range 0-99.97o (0-9.99 volts). For an output
between 1 and 9.99 volts, the high range must be used.
However, an output of less than 1 volt could be pro¬
grammed with either range. Using only the high range
makes programming slightly simpler, but range
decoding provides for better resolution in the low end.
Figure 40 shows a method of implementing range
decoding.
OUTPUT 706 USING
HP 85 Command
HP-iB Select Code
Address of
59501A
"Image" or format—™
of data word
to be sent will follow
output
Suppress carriage
return and line feed
13