Agilent Technologies 4156b, User Manual

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1-20 Agilent 4155B/4156B User’s Guide Vol.2, Edition 5
Measurement Units
Pulse Generator Unit (PGU)
Pulse Generator Unit (PGU)
Two pulse generator units (PGUs) are available, which are in the 41501A/B (SMU
and pulse generator expander). Each PGU provides a pulsed output, and can also
function as a dc source. For pulsed output of PGU, you can select 50
W
or Low
impedance. Figure 1-8 shows simplified PGU circuit diagram.
Figure 1-8 Simplified PGU Circuit Diagram
The PGU output value is defined to be the value that is output if the PGU output
terminal is open. So, when a load is connected and PGU impedance is set to 50
W
,
the actual output value will be different. For example, if connected load is 50
W
,
specified PGU output impedance is 50
W
, and specified output value is 2 V, the PGU
outputs 1 V.
Table 1-14 shows the PGU setting ranges and resolutions.
Table 1-14 PGU Setting Ranges and Resolutions
Range
Peak Setting
Value
a
a. Maximum peak-to-peak voltage is 40 V.
Base Setting
Value Resolution
Maximum
Current
b
b. If pulse width
£
1 ms, pulse duty is
£
50 %, and average current output is
£
±100 mA, the peak current output can be up to ±200 mA.
20 V 0
£ ½
V
½ £
20 V 0
£ ½
V
½ £
20 V 4 mV ±100 mA
40 V 0
£ ½
V
½ £
40 V 0
£ ½
V
½ £
40 V 8 mV ±100 mA