FREQUENC Y MEASUREMENTS
Range: 0 to 50 MHz (dc input). 25 Hzto 50 MHz
(ac input, maximum sensitivity).
Gate Time: l prsec to l0seconds indecade steps.
Accuracy: r 1 count r time base accuracy
Reads In: kllz or MHz with positioned decimal
point; units annunciator in line with digital
display.
Self Check: counts 10 MHz for the gate time
chosen by the time base selector switch.
SCALING
Frequency Range: 0 to 50 MHz.
Factor: by decades up to 109, switch selected
on rear panel.
Input: front panel, Signal Input.
Output: in place of time base output f requencies.
PE RIOD AVERAGE MEASUREMENTS
Range: Single Period 0 to 1 MHz
Multiple Period 0 to 300 kHz
Periods Averaged: 1 period to 105 periods in
decade steps.
Accuracy: t 1 count t time base accuracy r
trigger error. *
Frequency Counted:
1 and 10 period lKz to 10 MHz indecade steps
100 period . 10 Hz to 10 MHz
1, 000 period. 100 Hz to 10 MHz
10, 000 period 1 kHz to 10 MHz
100, 000 period 10 t<IIz to 10 MHz
Reads In: sec, ms, ps, with positioned decimal
point; units annunciator in line with digitaf
display.
SeIf Check: Gate time is 10ps to1 sec (periods
averagedof 100 kHz); counts 100 kHzfromthe
time base.
RATIO MEASUREMENTS
Displays: (ft/tZ) times period multiplier.
Range: f1 - 0 to 50 MHz. fZ - 0 to 1 MHz in
single period. 0 to 300 kHz in multiple period;
periodi averaged 1 to 105 in decade steps.
Sensltivity: 0. 1 v rms, each input.
xTrigger erroris less than +0.370of oneperiod ; periods
averaged for signals rvith40db or better signal-to-noise
ratio.
r* After 72 hours of continuous operation.
Accuracy: + 1 count 9f f1 r trigger error* of fr.
f1 is frequency applied to the decimal countels
(enters Time Base Ext. jack on front panel);
f.2 is frequency applied to decade dividers
(enters Signal Input jack).
Reads In: Dimensionless; positioned decimal
point for number of periods averaged.
SeIf Check: Period Average Setf Check applies.
TIME BASE
Frequency (internal): 1 MHz.
Stability: Aging Rate - less than 3 parts in 109
per 24 hours. r* As a Fupction of Temperature:
lessthan 12 parts in 1010/'C -20'C to +55"C"
As a Function of Line Voltage: Iess than + 5
parts in 1010 for +!\Vs change in line voltage
from 115v or 230 v rms.
Short Term - less than 2 parts in 1010 ,*,
withmeasurement averaging timeof one sec-
ond under constant environmental and line
voltage conditions.
Adjustment: Fine frequency adjustment (range
approximatety 4 parts in 108) and medium
frequency a{justment (range approximately
1 part in 10o) are available from the front
panel through the plug-in hole. Coarse fre-
quencJ adjustment (range approximately 1 part
in 100) is available at the rear of the instru-
ment.
Output Frequencies:
Rear Panel: 0. 1 Hz to 10 MHz in decade
steps; switch selected on rear panel; all fre-
quencies available in manual function without
interruption at reset except 100 Hz, l0 Hz, 1
Hz, and 0" I Hz which are interrupted by
manual reset; 10 kHz to 10 MHz available
continuously in a1l functions; 1 kHz available
continuously for all functions except 100K
period average; stability same as internal time
base; 5 volts p-p rectangular wave with 1000
ohm source impedance at 1 MHz and lower; 1
volt rms sine wavewith 1000 ohm source im-
pedance only at 10 MHz.
Front Panel: 0.1H2 to l MHz in decade steps;
selected by Time Base switch; availability as
defined under Output Frequencies above; sta-
bility same as internal time base; I v p-to-p.
External Standard Frequency: 1 MHz, 1 volt,
rms, into 1000 ohms required at rear panel
BNC connector.
GENERAL
Registrqtion: 8 digits in-line with rectangular
NixieQ tubes and display storage; 99,999, 999
maximum display; total width of B digit display
including illuminated units annunciator and
auto-positioned decimal point indication does
not exceed ? inches.
Section I
Table 1-1 Model 5245L
Table 1-1. Specifications
r-2 02349-1
