Passive Voltage Probes; General Purpose (High Input Resistance) Probes; High Voltage Probes - Tektronix 2212 User Manual

Probes
Passive Voltage Probes
5 - 68
Passive probes measure voltage. They employ passive circuit com-
ponents such as resistors, capacitors and inductors. The common
classes of passive voltage probes are:
- General purpose (High input resistance) probes
High voltage probes
General Purpose (High Input Resistance) Probes
These are considered "typical" oscilloscope probes. Two passive
probes are included with the 2212. The high input resistance of
passive probes (typical 10 MQ) provides negligible DC loading.
Their capacitive loading however, can distort timing and phase
measurements. High input resistance passive probes are preferred
for measurements involving:
Device characterization (above 15 V, thermal drift applications)
Maximum sensitivity using lX high impedance passive probes
Between 15 and 500V
Qualitative or go/no-go measurements
High Voltage Probes
High voltage probes have attenuation factors in the l00X to lO00X
range. The considerations which apply to other passive probes
apply equally well to the high voltage probes, with a few excep-
tions. The voltage range on high voltage probes varies from lkV to
20 kV (DC + peak AC), resulting in probe head mechanical designs
which are larger than their passive probe counterparts. High volt-
age probes have the added advantage of lower input capacitance,
although this is offset by the reduced sensitivity.
The 2212 works with the P6009 and the P6015 high voltage probes
for lMQ inputs. The P6009 works with a maximum input voltage
of 1.5 kV DC+ peak AC and the P6015 maximum input voltage is
20 kV+ peak AC continuous (or 40 kV peak for less than 100 ms)
In Detail