Making Preparations for Measurements
2.6 Connecting Logic Probes
Logic Signal Input Port
Connect a logic probe (701988 or 701989) to a logic signal input port on the front panel.
LOGIC(L) port
(standard equipped)
LOGIC(A|B) ports
(equipped on models
with the /L16 option)
About Logic Probes
The 701988 and 701989 logic probes are designed to be connected to the instrument’s logic signal
input port. Use an appropriate connection lead to connect to the point of measurement. Do not alter
the connection lead. Doing so may prevent the lead from satisfying the specifications.
The logic port has eight input terminals. You can set the threshold level in the instrument’s menu.
Recommended probes: 701988 and 701989
Logic Input Specifications When Used with the Instrument
The specifications of the 701988 and 701989 are as follows. For details, see page 6-3.
Item When using the 701988 When using the 701989
Maximum toggle frequency
1
100 MHz 250 MHz
Number of inputs 8
Maximum input voltage
2
±42 V (DC + ACpeak) or 29 Vrms ±40 V (DC + ACpeak) or 28 Vrms
Input range ±40 V ±6 V (around the threshold level)
Maximum sample rate 1.25 GS/s (interleave mode off)
Threshold level ±40 V (resolution: 0.05 V) ±6 V (resolution: 0.05 V)
Threshold accuracy
1
±(100 mV + 3% of setting)
Minimum input voltage
1
500 mVp-p 300 mVp-p
Input impedance Approx. 1 MΩ, approx. 10 pF (typical)
3
Approx. 100 kΩ, approx. 3 pF (typical)
3
Preset threshold levels CMOS (5 V) = 2.5 V, CMOS (3.3 V) = 1.65 V, CMOS (2.5 V) = 1.25 V,
CMOS (1.8 V) = 0.9 V, and ECL = –1.3 V
1 Under standard operating conditions (see section 6.11) after warm-up
2 For frequencies up to 1 kHz
3 Typical values represent typical or average values. They are not guaranteed.
2-17
IM DLM4038-03EN
2
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