Agilent Technologies 4294A Specifications download pdf (Page 44)

3-4. Test cables

When the DUT is tested apart from the instrument, it is necessary to extend the test ports

(UNKNOWN terminals) using cables. If the cables are extended without regard to their length, it will

cause not only an error, but will also result in bridge unbalance making measurement impossible.

3-4-1. Agilent supplied test cables

Agilent Technologies supplies 1 m, 2 m and 4 m cables as listed in Table 3-2. The test cables from

16048A to 16048E are constructed using the same cable material. The 16048G and 16048H employ a

high quality cable to insure low-loss transmission characteristics that specifically match to the

4294A. The cable length and the usable frequency range must be considered when selecting a test

cable. Agilent’s instruments can minimize the effects of test cables because the error of the cable is

known. The measurement error will increase according to the cable length and the measurement

frequency.

Table 3-2. Agilent supplied test cables

3-4-2. User fabricated test cable

Using cables other than those supplied by Agilent is not recommended. The cable compensation

function of the instrument may not work properly in non-Agilent cables. If there is an unavoidable

need to use non-Agilent cables, then use the same or equivalent cable that is used to make the

Agilent test cables. The Agilent part number of the cable used for frequency below 30 MHz is 8120-

0367 (not applicable to the 4294A.) Electrical specifications for these cables are provided in Figure

3-8. Do not use test cables other than Agilent supplied cables for higher frequencies. To extend the

cables using the 4TP configuration, the cable length should be 1 m or 2 m so that the measurement

instrument can compensate for it (depending on the instrument’s cable length compensation func-

tion). If there is an error in the cable length, it will cause additional error. A detailed discussion is

provided in Section 4.

Test cable Cable Maximum Connector Applicable instruments

length frequency type

16048A 1 m 30 MHz BNC 4263B, 4268A, 4279A,

16048B SMC E4980A, 4284A, 4285A, 4288A

16048D 2 m 30 MHz BNC 4263B, 4268A, 4279A, E4980A, 4284A,

4285A, 4288A

16048E 4 m 2 MHz 4263B, E4980A, 4284A

16048G 1 m 110 MHz 4294A

16048H 2 m 110 MHz 4294A

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Agilent Technologies 4294A Specifications Page 44