Measurement Computing DAC488 v.1 - Manual (Page 28)

22 DAC488 Power & Assembly DAC488 User’s Manual
To Verify the Port Voltage – 1-Volt Range
1. Send the following command string to the DAC488: C0 P1 A0 R1 V1 X where:
•
C0 = Direct Control Mode
•
R1 = 1-Volt Range
•
P1 = Port 1
•
V1 = Output +1 Volt
•
A0 = Autorange Off
•
X = Execute
2. Send the following command string to the 199 DMM: F0 R2 Z0 N1 S1 X where:
•
F0 = DC Volts
•
N1 = Scanner Channel 1
•
R2 = 3-Volt Range
•
S1 = 5 ½ Digit Resolution
•
Z0 = Zero Disabled
•
X = Execute
3. For each test, the specific Value Output ( V ) command, its commanded output voltage, and its
corresponding Low Limit and High Limit, are as follows:
•
V1 = Output +1 V +0.9980
≤
Reading
≤
+1.0020 Volts
•
V0.5 = Output +0.5 V +0.4985
≤
Reading
≤
+0.5015 Volts
•
V0.1 = Output +0.1 V +0.0989
≤
Reading
≤
+0.1011 Volts
•
V0 = Output 0 V -0.0010
≤
Reading
≤
+0.0010 Volts
•
V-0.1 = Output –0.1 V -0.1011
≤
Reading
≤
-0.0989 Volts
•
V-0.5 = Output –0.5 V -0.5015
≤
Reading
≤
-0.4985 Volts
•
V-1 = Output -1 V -1.0020
≤
Reading
≤
-0.9980 Volts
Data Transfer Speeds
The DAC488 has been measured to perform at the approximate speeds listed below. All explanations
discuss only one port, although the information given is valid for any port. These values are relative to the
controller used. The speeds you encounter may vary.
•
Output of Data to the Analog Ports: When sending data to the analog outputs on a port of the
DAC488, the outputs may be changed about once every 4 milliseconds when specifying voltages in
bits, or once every 25 milliseconds when specifying voltages in volts.
•
Output of Data to the Digital Output Port: Data may be sent to the digital output port at an
approximate rate of once every 2.5 milliseconds.
•
Input of Data from the Digital Input Port: The digital input port may be read at an approximate rate
of once every 75 milliseconds.