Anritsu Spectrum Master MS2711D Programming Manual page 107

Set Spectrum Analyzer Impedance – Control Byte #116 (74h)
Description: Set the impedance and the loss value due to an adapter.
The MS2711D can automatically compensate for the effects of impedance adapters. The impedance of the
MS2711D is 50Ω, so there is no need for an adapter in this case. The loss for the Anritsu 75Ω adapter 12N50-75B
is known by the MS2711D.
This control byte also allows for the specification of the impedance and the loss due to an adapter the system does
not know. In either case, 5 bytes must be sent to the unit. If the impedance is 50Ω or one of the known adapters is
specified, bytes 2-5 are ignored. If an unknown adapter is specified, the unit uses bytes 2-5 to correct for the
adapter.
Bytes to Follow: 5 bytes
1) Impedance Adapter
2) Impedance Loss
3) Impedance Loss
4) Impedance Loss
5) Impedance Loss (Lowest byte)
Spectrum Master Returns: 1 byte
1) 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error
238 (EEh) Time Out Error
449
Impedance Adapter: 00h = 50 Ω 0Ah = 75Ω, adapter 12N50-75B 0Ch = 75Ω, other adapter offset
450
Send the loss value as value in dB* 1,000
106
449
450
(Highest byte)