Section V Model 350C/D
Paragraphs 5-15 to 5-16
c. Adjust the output of the dc voltage source to 50 Note: Do not use the 15 volts range or lower on the
volts if checking a Model 350C or to 55 volts if check- Leeds and Northrup Model 7592. These ranges will
ing a Model 350D. All voltage readings are as indicated cause an impedance mismatch between the volt box
by the voltage divider and potentiometer setup. and Model 3 50C/D, degrading the attenuator accuracy.
5-15. AC CALIBRATION AND ACCURACY.
d. Change the 10 DB attenuator in 1 db steps and
5-16. The ac accuracy of the Model 350C/D may be
compare the readings with those given in table 5-2 or
verified using a substitution technique with a ratio
5-4. Return the 10 DB knob to the ?0? setting.
transformer or another attenuator, accurately cali-
brated. If a complete calibration check is desired
e. Change the 100 DB section in 10 db steps and which covers the entire frequency range, contact
compare the readings with those given in table 5-3 your @ Engineering Representative or return the
or 5-5. Model 350C/D to the @ Customer Service department.
Table 5-2, Model 350C 10 DB Attenuator Check Table 5-4.
With Input Set to 50 Volts
Attenuator Minimum Nominal Maximum Minimum Nominal Maximum
Setting Reading Reading Reading Setting Reading Reading Reading
44.565~ 48.330~
39.71 5v 4 3,. 070v
35.390~ 38?.381v
31.550~ __ 34.204~
28.115~ 30.488~
6 25.060~ ij 27.174~
22.335~ 24.218~
19.905~ 21.583~
9 17.740~ 9 19.243~
10 15.810~ 10 17.145~
Table 5-3. Model 350C 100 DB Attenuator Check Table 5-5. Model 350D 100 DB Attenuator Check
With Input Set to 50 Volts With Input Set to 55 Volts
I Attenuator I Minimum I Nominal I Maximum1 Attenuator Minimum Nominal I Maximum I
Reading Reading Reading Setting Reading Reading Reading
15.367~ 15.810~ 16.291~ 10 16.897~ 17.391~ 17.901~
20 4.863~ 5.000~ 5.151~ 20 5.350~ 5.50~ 5.666~
30 1.537~ 1.581~ 1.629~ 30 1.691~ 1.739~ 1.792~
40 ,4863~ ,500~ ,5151~ 40 0.535~ 0.550~ 0.566~
50 .1537v .1581v .1629v 50 0.1691~ 0.1739~ 0.1792~
60 .0486v .050v .0515v 60 0.0535~ 0.055~ 0.0566~
70 15.37mv 15.8mv 16.29mv m ?I 169.lmv J23.9mv 179.2mv
80 4.72mv 5.0mv 5.29mv 80 ? 5.19mv ? 5.5mv 5.82mv
90 1.49mv 1.58mv ?I- 1.68mv 90 1.64mv 1.74mv 1.84mv
100 472uv 500uv 100 519pv 550pv
I GALVANOMETER
1 1 ST:;lYRD I
BD - H- 274
Figure 5-5. Test Setup for DC Performance Check
5-4 01307-1 |
ACEC
