2-12
IM DLM4038-03EN
Precautions to Be Taken When Using Voltage Probes Other Than
Those Provided with the Instrument
• When measuring a signal that includes a frequency close to 500 MHz, use a probe with a frequency
range above 500 MHz.
• Measurement will only be correct if the attenuation ratio is set properly. Check the attenuation ratio
of the probe that you are using and set it properly.
Setting the Probe Attenuation Ratio or the Voltage-Current
Conversion Factor
When using a probe not supported by the probe interface connectors, set the instrument’s
attenuation ratio or voltage-current conversion factor to match the probe attenuation ratio or voltage-
current conversion factor. If the instrument’s settings do not match the probe specifications, correct
measurement values will not be displayed.
Connecting a Probe Supported by the Probe Interface
Connectors
• If you connect a probe supported by the probe interface connector to the instrument, the probe type
is automatically recognized, and the attenuation ratio set.* Also because power is supplied to the
probe through the probe interface, it is not necessary to connect the probe power cable to the probe
power terminals.
• You can execute automatic zero adjustment on a current probe that is compatible with the probe
interface connector.
* For a list of compatible probes, see “Optional Accessories” on page vi.
Connecting an FET Probe, Current Probe, Differential Probe, or
Deskew Correction Signal Source
If you are using a YOKOGAWA FET probe, current probe, differential probe, or deskew correction
signal source, use one of the probe power terminals (option) on the instrument’s right side panel as the
power supply.* For details on the connection procedure, see the manual that came with the product
that you want to use.
* For a list of probe and signal source models, see “Optional Accessories” on page vi.
CAUTION
Do not use the probe power terminals (option) on the instrument’s right side panel for
purposes other than supplying power to an FET probe, current probe, differential probe, or
deskew correction signal source. Also, be sure that the total current of the eight probe power
terminals and the eight probe interface terminals does not exceed 2.0 A for ±12 V or 1.6 A
for ±5 V. Otherwise, the instrument or a device connected to the probe power terminals may
break.
French
ATTENTION
Ne pas utiliser les bornes d’alimentation de sonde (option) sur le volet droit de l’instrument
à d’autres fins que l’alimentation de la sonde FET, sonde de courant, sonde différentielle ou
source de signal de correction Deskew. Vérifier également que le courant total des huit bornes
d’alimentation de sonde et des huit bornes d’interface de sonde ne dépasse pas 2,0 A pour
±12 V ou 1,6 A pour ±5 V, car cela aurait pour effet d’endommager l’instrument ou l’appareil
connecté aux bornes d’alimentation de sonde.
2.4 Connecting Probes
