Tektronix TM 5006 manual Calibrati on-ΤΜ, Services Available, Test Equi pment Required, All 0.3Ω

Calibrati on-ΤΜ 5006

I NT ERNAL AD JU ST MENT PR OC ED URE

Introduction

This procedure shoul d be performed if t he i nstrument fails to meet the performancei requirements of the elec-

trical characteristics listed n the Specificationi sectio n of this manual . To ensur e continued nstrument accuracy, it is recommended that adjustment be perform ed every 1000 hours of operation or every 6 months if used infrequently. A djustment is also recommended followi ng i nstrument

repair or modificatio n. Adjustments must be made in an ambient temperature of +20°C to +30°C.

Services Available

Tektronix, Inc. pr ovides complete instrument repai r and adjustment at local field service centers and at the factory service center. Contact youri local Tektronix fiel d office or representative fo r further nformation.

Test Equi pment Required

Test equi pment (or equivale nt) listed i n Table 4-1 is required for adjustment of the ΤΜ 5006 . Specificatio ns given for the test equi pment are the minimum necessaky for accurate adjustment. All test equi pment is assume d to be correctly cali brated and operati ng within specificatio n. If ot her testequipment issubstituted, thecalibration setup may need to be alte red to meet t he requirements of the eq ui pment used.

Adjustment Access

R emove the top and lift side covers to gain access to the +8 V buses, ground buses and the adjustments . Fig ure 4-4 shows the adjustment locations.

Power Li mit Adjustment

The Ρωr Lim adjustment, R 2060, is used for troubleshooti ng only . Before beginning calibration make certai n this adjustment is fully cw .

2.Adjust clock Oscillator (SN Β021520 and above)

α. Set the line voltage to 88% of the nominal value fo r the selected range.

b.Connect α frequency counter to pin 1, U 1950 .

ε. ADJU ST- R1855 for α reading of 20 kHz on the counter.

d. Connect α load as described in Fig . 4-3 from +8V to ground.

e.Co nnect α load as described in Fig . 4-3 from +26V to ground.

f.Connect α load as described in Fig . 4-3 from -26V to ground.

All 5.0n

Load for ±26V supplies. Use three 5.091 25W 5% resistors in series (Tektronix P art Number 308-0177-00) .

All 0.3Ω

Load for +8V supply . Use 8 0.3Ω 25W 5% resistors as shown (Tektronix P art Number 308-0691-00) .

2950-45

1 . Adj ust 8 V Adj

α. Connect the dvm to the +8 V and Grid terminalsi as shown in Fig . 4-2. The voltage bus location is shown n Fig. 4-5.

b. Set the line voltage to nominal for the selected range .

c. CHECK -for α reading of 8.2 V .

d. ADJUST- R2151, 8 V Adj fo r α dvm reading of 8.2 V .

Fig . 4-3. Loads for use in internal adjustment procedure.

g.ADJU ST- R1855 slowly εω until the dvm reading just begins to dec rease . Note the frequency reading on the counter.

h. ADJUST- R 1855 εεω for α counter reading 0.25 kHz lower than the reading noted above.

i. R emove all connections.

This completes the internal adjustment proced ure.

REV NOV 1984 4-5