Anritsu ML2437A - GPIB Emulation Modes

GPIB Emulation Modes GPIB Operation
8-84 PN: 10585-00001 Rev. P ML2437A/38A OM/PM
8-9 GPIB Emulation Modes
The ML243xA power meter emulates the GPIB communication of other power meters. The
emulation mode can be set through the front panel SYSTEM > more > more > Rear panel >
GPIB > MODE menu (see Chapter 4, Operation) or through the GPIB command EMUL. The
available emulation modes and command restrictions are:
In some cases, there are differences between the ML243xA in emulation mode and the actual
meter being emulated. These differences are presented in the following sections.
Zeroing a Sensor
The time taken for an ML243xA to complete the ZEROing sequence for a sensor differs from
the time taken by the emulated power meters. Any GPIB control programs that ZERO the
power meter will have no problems with this time difference if the defined ZEROing controls
and/or sequences for the device being emulated are followed.
• The HP436 uses the 'Z1T' AUTO ZERO sequence described in the HP436 manual.
• The HP437 and HP438 use bit 1 of the status byte to indicate ZERO or CAL completion.
• The ML4803 uses bit 0 of the status byte to indicate that the ZERO sequence is not
complete.
Sensor Ranges
The sensor operating ranges for the ML2430 power meters are different from those of the
meters being emulated. Refer to the specific range information for range commands in each
emulation section.
Output Format
In the HP437 and HP438, the format of the readings agrees with the format specified in the
manuals, which may differ from the output from some HP437 and HP438 units.
For example: -14.236 may be output by the HP437 or HP438 as '-14.236e00' or '-1.4236e+01'.
The ML243xA in HP437 or HP438 emulation modes will output as the manual specifies
'-1.4236e+01'.
Table 8-5. Emulation Modes
Power Meter Command Restrictions
Hewlett-Packard HP436 All commands supported.
Hewlett-Packard HP437
Commands not supported : DN, DU, ERR?,
LP, LT, SP, UP and @2.
Hewlett-Packard HP438
Commands not supported : DO, LP1 and
LP2.
Anritsu ML4803
Commands not supported : PCT, VSW, RDB,
DBV50, DBV75, VLT50 & VLT75.