8250A Optical Power Meter Operation Manual
A.3 Remote Execution Time (Typical Value)
A-5
A.3 Remote Execution Time (Typical Value)
Execution time measurement conditions
Computer:
OPTIPLEX GX270 manufactured by DELL
GPIB hardware:
PCI-GPIB manufactured by NATIONAL INSTRUMENTS
GPIB driver:
Niglobal.bas, Vbib-32.bas (Included software in PCI-GPIB)
USB driver:
ADC Instruments USB Driver manufactured by ADC CORPORATION
Compatible language:
Microsoft Visual Basic 6
API function used in the measurement:
QueryPerformanceCounter
(Unit: msec)
Command
GPIB
USB
Obtaining one measured data
when free running.
FAST
98.8
98.6
MED
197.3
196.1
SLOW
494.4
492.6
Obtaining one measured data
when setting trigger HOLD.
(Time from the *TRG com-
mand input to the measured
data output)
FAST
"*TRG"
80.3
80.2
MED
SLOW
Range changing time
"R4" to "R11"
205.0
205.0
Zero correction "ZR"
"ZR"
2246.8
2239.3
Initialization
"*RST"
257.8
256.1
Device clear
"C"
90.9
29.7
Wavelength setting 780
790 nm
"WL"
15.6
0.8
Display unit dBm
W
"DW"
15.6
5.4
Trigger mode HOLD
AUTO
"M"
15.6
0.8
Smoothing count 10
99
"ST"
15.6
4.1
The query execution and query reply read-
ing
"WL?"
31.2
5.0
"DW?"
31.1
5.0
"M?"
31.1
5.0
"ST?"
31.2
5.0
"*IDN?"
31.2
5.3