Function generator supply in 2026 splits into three practical lanes: India-based OEM/ODM builders shipping 2 MHz to 25 MHz analog and DDS units, global catalog distributors (Cole-Parmer, Jameco) reselling Siglent, GW Instek, B&K Precision and Teledyne LeCroy, and a narrow EMC-immunity specialist tier that sells combined surge/burst/ESD generators rather than general-purpose waveform sources [S1][S4][S5][S6].
A bench engineer who needs a 40 MHz, 1.2 GSa/s dual-channel DDS unit, a 2 MHz analog teaching unit, or a 100 kHz arbitrary generator can typically be sourced in 2-4 weeks through these channels, with list prices clustering between $250 and $5,000 depending on bandwidth, channel count, and modulation depth [S3][S5][S7].
India OEM base: where 2 MHz to 25 MHz analog and DDS units are actually built
India is the dominant low-cost OEM base for sub-30 MHz function generators, with Scientific India, Scientech, and Excel Technologies advertising direct-from-factory pricing and OEM/ODM capacity on the same product lines sold globally as Tektronix, GW Instek, or Siglent [S1][S2][S7]. Excel Technologies lists a 2 MHz general-purpose function generator at INR 9,775 per piece (about $117 at 2026 exchange), making it the lowest-cost credible analog unit a process engineer can buy for a training lab or a simple transducer excitation loop [S7].
Catalog filters on Scientific India's product page separate units by number of channels, maximum frequency, and whether a frequency counter is integrated, which is the same three-axis selection any engineer should apply when comparing quotes [S1]. Scientech (Indore-based) lists function and arbitrary waveform generators alongside 13 other test-and-measurement categories, and explicitly markets to education, R&D, and defence electronics buyers, which is why its datasheets tend to be richer on modulation modes than on EMC compliance data [S2].
Global catalog distributors: Siglent, GW Instek, B&K Precision, Teledyne LeCroy
Catalog resellers carry the mid-bandwidth tier that most test labs actually specify. Siglent's SDG2042X, a 40 MHz dual-channel function/arbitrary waveform generator with 1.2 GSa/s sample rate, ships through Jameco under part number 2292927 and shows up routinely in 2026 comparison shortlists against the Rigol DG800 and GW Instek AFG-200 series [S5].
GW Instek (Good Will Instrument) groups its signal-generator family into four sub-categories on its 2026 product page: function generator, AM/FM signal generator, audio generator, and RF signal generator, and that four-way split is a useful taxonomy for any spec writer who is unsure whether the application needs an analog AFG or a vector-modulated RF source [S8]. Cole-Parmer's 2 September 2026 refresh of its function generator category page sits inside a much larger "Electrical Testing" instrument tree, with hundreds of SKU cross-links to power supplies, multimeters, and process controllers, which is the right place to start if a function generator is being bundled with other bench instruments for a single PO [S4].
17-brand comparator tables and how to read them
Metoree's 2026 index lists 17 function generator manufacturers globally, with B&K Precision, Madell Technology, and Teledyne LeCroy as the top three ranked entries; the list is a directory, not a spec comparison, so it should be used only to populate the candidate list before the engineer benchmarks bandwidth, harmonic distortion, and arbitrary-waveform memory on the datasheet itself [S3].
For a fair four-way comparison on a 2026 shortlist, an engineer should at minimum score the candidate units on: (1) maximum sine frequency (2 MHz for analog teaching, 25-40 MHz for DDS bench, up to 500 MHz for RF-microwave), (2) channel count (single, dual, or four), (3) sample rate on the arbitrary channel (typically 125 MSa/s to 1.2 GSa/s), and (4) modulation depth and modulation modes (AM, FM, PM, FSK, PSK, sweep, burst). A 25 MHz dual-channel DDS with 500 MSa/s and AM/FM/FSK will satisfy about 80 percent of bench service work; a 2 MHz analog unit is a teaching tool, not a service instrument.
EMC-immunity specialist tier: surge, burst, and ESD combined generators
Function generators stop being the right tool once the test plan involves IEC 61000-4-x immunity pulses. The EMC-directory.com 2026 listing of multi-function generator manufacturers groups 3Ctest, AMETEK CTS GmbH, EMC PARTNER AG, HILO-Test, M Precision Laboratories, PFIFFNER Systems, and Advanced Test together because they all build combined surge/burst/ESD/pulse generators, not arbitrary waveform instruments [S6].
Pricing and lead-time signals worth tracking
Three trackable signals matter through Q4 2026: (a) the INR-to-USD exchange rate, which directly moves India-OEM quotes that are denominated in rupees (Excel Technologies' INR 9,775 list is the cleanest benchmark) [S7], (b) the Siglent/Rigol/GW Instek channel allocation from the Shanghai hub, which sets 4-8 week lead times for 40 MHz DDS units, and (c) the EMC-immunity specialist order book at the 3Ctest and EMC PARTNER level, where combined surge/burst/ESD lead times can stretch to 12-16 weeks when European car-OEM requalification cycles run.
For a sourcing map that goes beyond instruments, see this multi-gas detector suppliers roundup, and for adjacent MEMS-instrument supply, this MEMS sensor Tier 1 sourcing map; both use the same tier-and-channel taxonomy that works on a function generator shortlist.
For component-level specifications, see vacuum generator, and static var generator.