Keithley 2002 User Manual

IEEE-488 Reference
3-80
REAL,32 or SREal will select the binary IEEE754 single precision data format. Figure 3-19
shows the normal byte order format for each data element. For example, if three valid elements
are specified, the data string for each reading conversion is made up of three 32-bit data blocks.
Note that the data string for each reading conversion is preceded by a 2-byte header that is the
binary equivalent of an ASCII # sign and 0.
REAL,64 or DREal selects the binary IEEE754 double precision data format and is shown in
Figure 3-20 (normal byte order shown). This format is similar to the single precision format
except that it is 64 bits long.
Figure 3-19
IEEE754 single precision data format (32 data bits)
Byte 1
70
Header
# 0
Byte 2
70
Byte 3
70
Byte 4
70
se f
s = sign bit (0 = positive, 1 = negative)
e = exponent bits (8)
f = fraction bits (23)
Normal byte order shown. For swapped byte order,
bytes sent in reverse order: Header, Byte 4, Byte 3,
Byte 2, Byte 1.
The Header is only sent once for each measurement conversion.

Keithley 2002 Specifications

General

Resolution	8.5 digits
DC Voltage Accuracy	±0.0006%
Maximum DC Voltage	1000 V
Maximum AC Voltage	750 V
Maximum DC Current	3 A
Maximum AC Current	3 A
Connectivity	GPIB, RS-232
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Resistance Range	10 Ω to 1 GΩ
Model	2002
Category	Multimeter
Interface	GPIB, RS-232
AC Current Accuracy	±0.1%
Frequency Range	0.1Hz to 300kHz
Display	VFD
Type	Digital
Power Supply	100-240V AC, 50/60Hz
Current Range (DC)	100 μA to 3 A
Current Accuracy (DC)	±0.01%
Current Range (AC)	100 μA to 3 A
Current Accuracy (AC)	±0.1%
DC Current Range	100 μA to 3 A
AC Current Range	100 μA to 3 A