Teledyne LeCroy AP033 - Manual (Page 15)

Operator’s Manual
922260-00 Rev A 9
can greatly reduce this effect by using short interconnection leads, and twisting them together to
minimize the loop area.
High common mode rejection requires precise matching of the relative gain or attenuation in the +
and – input signal paths. Mismatches in additional parasitic capacitance, inductance, delay, and a
source impedance difference between the + and – signal paths will lower the common mode
rejection ratio. Therefore, it is desirable to use the same length and type of wire and connectors for
both input connections. When possible, try to connect the inputs to points in the circuit with
approximately the same source impedance.
If AC coupling is desired, install the AC coupling accessory on the probe tip before connecting it to
the test circuit. The low-frequency cutoff (–3 dB point) of the AC coupler is approximately 16 Hz.
If the voltage in the test circuit requires more than ÷10 attentuation, add the external ÷10
attenuator to the probe tip. If using both the external attenuator and AC coupler, install the
attenuator on the probe tip first, then install the AC coupler on the attenuator input.
In addition to being compatible with the included lead set, the probe input connectors will mate
with standard 0.025 in. (0.635 mm) square pins in any rotational orientation. To avoid damaging
the input connectors, do not attempt to insert connectors or wire larger than 0.036 in. (0.91 mm) in
diameter. Avoid rotating square pins after they are inserted into the input connectors.
The included accessories simplify the task of connecting the probe to the test circuit:

Use the small (0.5 mm) mini clips with the flexible lead set when connecting to fine-pitch
surface mount
IC leads .

Use the larger (0.8 mm) mini clips to connect to through-hole leaded components.

Use the offset round pins for hand-held probing applications. Reposition the pins by
rotating them to obtain the required spacing.