Manual - 8500A Series Peak Power Meter - Giga-tronics

Series 8500A Peak Power Meters
MRKAm,snn.nnnEsnn
For channel B, the output is:
MRKBm,snn.nnnEsnn
(m = marker number; s = polarity; nn.nnn = delay in seconds; Esnn = exponent)
Because markers are always placed in the 8500A, the MKDF and MKPA commands described next will
take only the latest computation and send it over the bus if they are included in the command string for
the 8500A. The MKDF-1 command is a No Op command because markers are always placed.
MKDFm,n
Place marker numbers m and n according to their previously defined % reference powers and positions on
the pulse profile, and output the difference between their respective delays. If channel A is in use, the
PPM will output:MDFA,m-n,nn.nnnEsnn.
If -1 is the argument for MKDF, markers m and n must have been previously defined for automatic
placement. Otherwise the default settings will be used. The defaults are:
• M1 = 2.5%
• M2 = 17.8%
• M3 = 46.9%
• M4 = 90%
If channel B is in use, the PPM will output:
MDFB,m-n,nn.nnnEsnn
(m = first marker number defined;
n = second marker number defined;
nn.nnn = the delay of m minus n in seconds;
Esnn = exponent)
MKPA
Place all four markers according to their previously defined % reference powers and
positions on the pulse profile and output their respective delays. For channel A, the
output is:
MRKA1,snnn.nnEsnn;2,snnn.nnEsnn;3,snnn.nn Esnn;4,snnn.nnEsnn
If channel B is in use, the output is:
MRKB1,snnn.nnEsnn;2,snnn.nnEsnn;3,snnn.nn Esnn;4,snnn.nnEsnn
The numbers 1, 2, 3 & 4 represent the marker numbers to be used. The snn.nnEsnn following each
marker number is the delay time of that marker with respect to the reference delay.
(s = polarity; nnn.nn = delay in seconds; Esnn = exponent.)
The arguments between each set of marker information are separated by a semi-colon.
If a marker number cannot be used for some reason or if the PPM could not place the marker, an SRQ
will be generated and the marker will not be placed. Then the instrument will output a delay of 0.00
00E-99 seconds for that marker. If all markers are placed successfully, a service request will be generated
and the status condition will be 31. If one or more markers are not placed for the reasons described
above, then the status condition will be 37 after SRQ.
Since markers are set at percentages of reference power and then the delay is computed by the 8500A
instruments, the MKDA and MKDB commands described next are classed as No Op with the 8500A
instruments.
3-30 Manual No. 20790, Rev C, November 1998
Superceded by Revision D, March 2009