ACCESSORIES
Operational Accessories
PROBES
P400-Series Low-Capacitance Probes— This series of
low-capacitance probes preserves the transient response
of Tektronix fast-rise instruments. The P400-Series probes
are free of overshoot and ringing and have relatively
uniform high-frequency response. With exception of the
P450-L, these probes can be used on other instruments
having input capacitances from 20 to 50 /x/xf. General
physical characteristics of the P400-Series probe are
identical to the P510A probe. Color-coding of the plastic
nose indicates attenuation ratio. Probes have 42" cable
with coaxial connector and are rated at 600 v peak-to-
peak. Two interchangeable Tektips— a straight tip and a
hooked tip— each adding less than 0.5 ju/uf to the input
capacitance, and an alligator clip assembly are supplied
with the probes.
P405, P410, P420 .................................................. 10.50
P450, P450-L, P 4 1 0 0 ........................................... 12.50
Replacement Tektips, each ........................................25
P400-SERIES PROBE SPECIFICATION
INPUT IMPEDANCE
Probe
Attenuation
Ratio
Resistance
(Megohms)
Capacitance DB Loss
Minimum* Maximumf at 30 MC
P405
5:1
5 1 2 ppi
19 ppi 1-2
P410
10:1
10 8 ppi
1 1 ppi 1
P420 20:1 10 5.5 ppf
7 fifii 1
P450 50:1
10
3.5 ppi
3.5 fifii 1
P450-L
50:1
10
2.5 ppf
1
P4100 100:1
10
2.5 ppf
2.5 fifii 1
"When connected to instruments with 20-fifii input capacitance.
fW hen connected to instruments with input capacitances up to 50 ppi.
P510A Attenuator Probe provides an attenuation of
ten times when used with Tektronix oscilloscopes and am
plifiers. The P510A is small and streamlined, and pre
sents an input impedance of 10 megohms paralleled by
1 4 /x/xf. The probe is completely insulated — made of
high-impact-strength fiberglass-reinforced alkyd — and
has an internal brass shield. Two interchangeable Tek
tips— a straight tip and a hooked tip, and an alligator clip
assembly are furnished. Probe has a 42" cable with co
axial connector, and is rated at 600 v peak-to-peak .
P 510 A ............................................................................... 8.50
P170CF Cathode Follower Probe was developed for
use with the Type 517 Oscilloscope. The cathode-fol
lower tube is a 5718 triode whose cathode load is the
170-ohm termination of the preamplifier grid line in the
Type 517. Plate and heater voltages for this tube are
provided at a four-terminal socket on the panel of the
oscilloscope. The signal is attenuated by 2 times when
using the P170CF. The input impedance of the probe
will depend on the attenuator head being used, also
since transit time in the cathode-follower tube is involv
ed, it will decrease appreciably at the higher frequen
cies. When the probe is used without an attenuator
head, the input looks like 12 megohms shunted by 5 /x/xf.
The probe cable is 42" long. Probe complete with 3 at
tenuator h ead s ............................................................ 8 6 .0 0
REPLACEMENT ATTENUATOR HEADS
PAX-1 Attenuator Head for P170CF, attenuation can
be varied between 4 times and 40 times............... 11.00
PAX-II Attenuator Head for P170CF, attenuation can
be varied between 2 0 times and 2 0 0 times
..........
1 1 .0 0
PAX-III Attenuator Head for P170CF, attenuation can
be varied between 2 0 0 times and 2 0 0 0 times. . . . 11 .0 0
P170CF can be used with the Type 513 Oscilloscope,
but low-frequency response will suffer somewhat, de
pending on the attenuator head being used. It is neces
sary to terminate the 170-ohm cable at the oscilloscope
input. B170R terminating resistor is designed for this.
(See terminations.) A rectifier kit, KP170CF, is recom
mended for installation in Type 513 to rectify the 6.3
volt heater supply.
KP170CF DC Filament Kit for Type 5 13
.................
4.50
A-6 Tektronix, Inc,
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