53220A/53230A Input Signal Conditioning 4
Keysight 53220A/53230A User’s Guide 137
For better access to test points on the device under test (DUT), Keysight
recommends its N2870A, N2873A, and N2874A Passive Probes for use with the
53220A/53230A counter. The 35 MHz (BW) N2870A 1:1 probe and the 500 MHz
N2873A and 1.5 GHz N2874A 10:1 probes are popular accessories commonly
used with Keysight oscilloscopes.
When using probes with the counter, specifying a probe factor references and
displays threshold levels and p-p levels relative to actual levels on the DUT,
rather than to the level at the channel input. The probe factor is set with the
command:
INPut[{1|2}]:PROBe {<factor>|MINimum|MAXimum|DEFault}
INPut[{1|2}]:PROBe? [{MINimum|MAXimum|DEFault}]
(query form)
Probe factor settings are 1 for a 1:1 probe (N2870A), and 10 for a 10:1 probe
(N2873A or N2874A). When set to 1, the counter ranges are 5 V and 50 V. When
set to 10, the counter ranges are 50 V and 500 V.
Probe input compatibility The input compatibility of the N2870A and N2873A
probes is 1 MΩ respectively. The compatibility of the N2874A is 50 Ω. Each is
compatible with the counter’s 20 pF input capacitance. When using a probe, the
counter input impedance should be set accordingly (1MΩ, 50 Ω).
CONFigure and MEASure do not change the probe factor setting. Following a
reset (*RST) or an instrument preset (SYSTem:PRESet or Preset key), the probe
factor is set to 1.
Input coupling
The input to the 53220A/53230A counter is either DC (direct) coupled or AC
(capacitive) coupled, and is set using the command:
INPut[{1|2}]:COUPling {AC|DC}
INPut[{1|2}]:COUPling? (query form)
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